"Until You" - Dave Barnes
I dont know that i would want it during the ceremony. but it'll have to be in the reception mix somewhere. The first time I heard this I was at one of DB's concerts and I spent the whole song with my jaw dropped open because the song was so lovely. he definitely saw me halfway through and smiled at my astoundedness.
Coming in at a close second is this one:
"God Gave Me You" - Dave Barnes